Gas cap



FIG. 1 is an upper perspective view of a gas cap showing the new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevation view thereof, the left side elevation view, front side elevation view and back side elevation view being mirror images thereof;

FIG. 4 is a sectional view thereof, taken along the line 4-4 in FIG. 2; and,

FIG. 5 is a side elevation view taken between the front and right sides along the line 5-5 in FIG. 2.

The portions of the Figures shown in phantom lines are not part of the design sought to be protected and are provided for illustrative and environmental purposes only. 

The ornamental design for a gas cap, as shown and described. 